Semester One Final Examinations, 2018 FIRE3700 Introduction to Fire Safety Engineering Question 2. (25 points) The archi

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Semester One Final Examinations 2018 Fire3700 Introduction To Fire Safety Engineering Question 2 25 Points The Archi 1 (326.38 KiB) Viewed 25 times

Semester One Final Examinations, 2018 FIRE3700 Introduction to Fire Safety Engineering Question 2. (25 points) The architect of the new extension for the Brisbane airport designed the high entrance area using a synthetic fabric at the ceiling. The ground-to-ceiling height is 9 m. The regulatory authority asks the designer to demonstrate that the synthetic fabric at the ceiling will not ignite given a worst-case fire scenario. The parties agree that this scenario should consist of a pile of luggage, thus calorimetry testing is commissioned for a set of random luggage. The testing shows that on average the peak heat release rate from a single piece of luggage is 220 kW. The regulatory authority also requested a flammability testing of the synthetic fibre that showed it had an ignition temperature of Tig = 300°C. If the temperature rise above the fire is described by the McCaffrey formulation: 2n-1 2BAT -(K)(-) = 2/5 T where "z" is the height from the base of the fire (m), Q is the heat release rate (kW), T is the ambient temperature in (K), and AT the temperature rise (K) at "z". The acceleration of gravity is g = 9.81 m/s² and the three constants for the plume temperature are K= 1.1, C=0.9 and n=-1/3. Answer the following questions: a) How many pieces of luggage have to be burning at once in order to ignite the synthetic fabric at the ceiling? (20 points) (2 points) b) Is this design fire reasonable? Explain why. c) Indicate which other elements of the fire strategy could be used to enable the use of this synthetic fabric at the ceiling. Would a sprinkler system be useful? Explain why. (3 points)